Steam generator or water heater



Oct. 6, 1931. H. F. MARR IOTT STEAM'GENERATOR OR WATER HEATER s Sheets-Sheet 1 Filed July 21, 1928 59 ol/mow Oct. 6, 1 931. MARRIQfT 1,826,358

STEAM GENERATOR OR WATER HEATER Filed July 21-, 1928 3 Sheets-Sheet 2 I H. F. MARRIOTT TEAM GENERATOR 0R WATER HEATER Filed July 21, 1928 3 Shets-Shet 3 lllll ullullui IIC ((L Patented Oct. 6, 1931 a $1,;

HUGH FREDERICK MARRIOTT, OF LONDON, ENGLAND STEAM GENERATOR OR WATER HEATER- Application filed July 21, 1928, Serial No. 294,385, and in Great Britain October 21, 1927.

This invention relates to steam generators or water heaters of the kind comprising an I outer casing and an inner casing between which is defined an annular water chamber from which short closed-ended tubes or thimbles project radially into a central heating space through which hot gases are passed. The invention has for its object to provide an improved steam generator or water heater 1; of this type utilizing as the heating medium exhaust gases from Diesel or other engines or other sources and acting as a silencer for such exhaust gases.

The invention is illustrated in the accom- 15 panying drawings in which Fig. 1 is a vertical section of a steam generator or water heater embodying certain features if my invention. Figs. 2 and 3 illustrate further embodiments showing various arrangements of adjustable baflies. Fig. 4 is a vertical section and Fig. 5 a horizontal section of a boiler'embodying certain features of the arrangement shown in Figs. 1 and 2.

In the various figures of the drawings, A denotes the annular water chamber of the steam generator enclosed between outer and inner casings, A, A respectively, and B denotes the central heating space into which thimbles C extend. I indicates the inlet for the exhaust gases and O the outlet.

In accordance with one feature of the invention and as shown particularly in Figs. 1, 2, 3 and 4 of the drawings a relatively large part of the central heating space of 3 the heater is left free from thimbles, so as to permit expansion of the exhaust gases and to reduce back pressure.

The portion of the water heater free from thimbles may be located at the upper end of the heater, as shown in these figures, and adjacent the outlet 0 for the exhaust gases to the atmosphere thus permitting expansion of the gases immediately before delivery to the atmosphere through the outlet 0. Expansion of the exhaust gases before delivery to thethimbled portion of the water heater is afforded by this free space when the exhaust gases are delivered at O to the upper end of the water heaterand pass out at the lower endat I. 5

The thimbled portion of the water heater and the portion free from thimbles provide a combined water jacketed silencer and heat combing device for the hot gases.

In order eficiently to comb the hot gases by means of the thimbles I prefer to provide baflies,preferably adjustable, by which todirect the hot gases among the thimbles. Various arrangements of bafliesare shown in Figs. 1 to 3 of the drawings. Referring to these figures it will be seen that I provide on a spindle D extending axially of the central heating space abaflie or baflles E suitably cup-shaped as shown and adapted to be clamped. to the spindle D in any adjusted position by means of setscrew F or the like. The baflles may be arranged as upright and inverted cups connected by a sleeve D as indicated in Figs. 1 and 3 or may be located adjacent one another as indicated by the two centrally located cups of Fig. 2, so as to provide the equivalent of a continuous baflie.

It will be appreciated that by virtue of the vertically adjustable arrangement of the bafiies it is possible to vary their position or to reduce or extend the baffling efiect to suit the characteristics of the engine or other source from which the hot exhaust gases are delivered to the steam generator or water heater.

In the embodiment shown in Figs. 4': and 5 the bafiie is in the form of a central core of general conical form which provides between itself and the inner wall of the water chamber or the edges of the thimbles an an- 5 nular heating chamber of gradually decreasing capacity in the direction of flow of the gases so as to tend to equalize the velocity of the gases throughout the water heater. In the embodiments shown the conical baffle is 90 formed of a metal cone mounted on a cupshaped base similar to the baffles E shown in the other figures. The bafile may be ad-j justed vertically on a central rod D and 5 locked in adjusted position by means of a set screw F, or may be secured to the rod D which may be raised and lowered from the exterior of the boiler by means of a hand wheel and threaded sleeve K engaging screw threads on the rod D.

I claim,

1. A steam generator including an outer casing, an inner casing spaced therefrom, said inner casing defining with said outer casi-ng an annular water chamber and itself defining' a central heating space for the passage of hot gases, short closed-end tubes projecting radi ally from said inner casing into said heating space, andbaille members in said heating space vertically adjustable within wide limits in order to control the velocity of gases at different points of'the space occupied'by the closed-end tubes,

2. A steam generator including an outer 2 casing, an inner casing spaced therefrom ,de-

finingwith said outer casing an annular water chamber and itself defining a central heat ing space for the passage of hot gases, short closed ended tubes projecting radially from :in said inner easing into said heating space, and

bafiling disposed within the heating space occupied by the closed ended'tubes, the inner casing defminga large cylindricalheating space between the radial'tubes andthe reduced-diametcr outlet, said'spacebeing entirely devoid of tubes and other obstructions, said battling being formed of opposed cup shaped members adj ustably mounted Within said heating space.

40 3. In a steam generator comprising an outer casing, an inner casingspaced therefrom defining with said outer casing an annular water chamber and itself bounding a central heating space for the passage of hot' gases,

4 5 short closed-ended tubes proj ecting radially from said inner easing into said heating space,

and a central battle formingwith said inner casing a heating chamber of gradually decreasing capacity in the direction of flow of the gases, the inner casing defining a large cylindrical heating space between the radial tubes and the reduced'diameter outlet, said space being substantially devoid of tubes and other obstructions, said'baflle being adjustableaxially in relation to the space occupied by the closed-ended tubes to control the velocity of the gases at different points of the space occupied by the closed-ended tubes.

In testimony whereof I have signed my name to this specification.

HUGH FREDERICK MARRIOTT, 

